Convert JsonWriter::Write to taking a const ref for the in-param

chrome/browser/task_profiler/task_profiler_data_serializer_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/json/json_writer.h"
 #include "base/process/process_handle.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/tracked_objects.h"
 #include "base/values.h"
 #include "chrome/browser/task_profiler/task_profiler_data_serializer.h"
 #include "content/public/common/process_type.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 void ExpectSerialization(
     const tracked_objects::ProcessDataPhaseSnapshot& process_data_phase,
     base::ProcessId process_id,
     int process_type,
     const std::string& expected_json) {
   base::DictionaryValue serialized_value;
   task_profiler::TaskProfilerDataSerializer::ToValue(
       process_data_phase, process_id, process_type, &serialized_value);
 
   std::string serialized_json;
-  base::JSONWriter::Write(&serialized_value, &serialized_json);
+  base::JSONWriter::Write(serialized_value, &serialized_json);
 
   EXPECT_EQ(expected_json, serialized_json);
 }
 
 }  // anonymous namespace
 
 // Tests the JSON serialization format for profiled process data.
 TEST(TaskProfilerDataSerializerTest, SerializeProcessDataToJson) {
   {
     // Empty data.
@@ skipping 86 matching lines @@
                         "\"run_ms_max\":205,"
                         "\"run_ms_sample\":203"
                         "},"
                         "\"death_thread\":\"PAC thread #3\""
                         "}],"
                         "\"process_id\":239,"
                         "\"process_type\":\"Tab\""
                         "}");
   }
 }